Strategy. The sixth paragraph of the section of the Funds Summary Prospectus and Prospectus titled Fund Summary Principal Investment Strategies is amended and restated as follows: The Underlying Index is constructed using a rules-based methodology to select companies from the Parent Index that have strong womens empowerment practices. Morningstar, Inc. (Morningstar or the Index Provider) constructs the Underlying Index using company level indicators, scores, and indicator relevance weighting from Equileap, the Funds ESG research provider, which seek to identify companies within the Parent Index that rate well with respect womens empowerment practices and products or services (a companys Gender Diversity Score). After excluding those companies that Equileap determines are (i) involved in the weapons, gambling, or tobacco industries, (ii) on the … Show more… The sixth paragraph of the section of the Funds Summary Prospectus and Prospectus titled Fund Summary Principal Investment Strategies is amended and restated as follows: The Underlying Index is constructed using a rules-based methodology to select companies from the Parent Index that have strong womens empowerment practices. Morningstar, Inc. (Morningstar or the Index Provider) constructs the Underlying Index using company level indicators, scores, and indicator relevance weighting from Equileap, the Funds ESG research provider, which seek to identify companies within the Parent Index that rate well with respect womens empowerment practices and products or services (a companys Gender Diversity Score). After excluding those companies that Equileap determines are (i) involved in the weapons, gambling, or tobacco industries, (ii) on the Norwegian Ethics Council List 1 or (iii) that have experienced an applicable legal controversy, the 200 best scoring companies (after applying the optimized weighting methodology discussed below) are selected by Morningstar as the final underlying index components. The Underlying Index is constructed by Morningstar using an optimized weighting methodology. Under this methodology, Morningstar uses a quantitative process that is designed to determine optimal weights for securities to maximize exposure to companies with higher rankings as to womens empowerment practices, while maintaining an Underlying Index that exhibits risk and return characteristics similar to those of the Parent Index. Morningstar determines the weighting of each security in the Underlying Index using the following variables: Gender Diversity Score, market capitalization, and maximum and minimum weightings by security and sector. Underlying Index constituents are subject to a maximum 5% per company weighting. Show less